Daily Camera: The combined heating effect of human-emitted greenhouse gases increased 1.5 percent between 2012 and 2013, according to an index maintained by scientists at the National Oceanic and Atmospheric Administration in Boulder. The 1.5 percent increase, announced Friday, brings the total increase in such gases added to the atmosphere to 34 percent since 1990. The data is tracked through NOAA's Annual Greenhouse Gas Index, maintained by the Global Monitoring Division of the Boulder-based Earth System Research...